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About

About

I got a Ph.D. in Informatics, Artificial Intelligence branch, at Universidade Nova de Lisboa, 1994.

I am currently Associate Professor at the Informatics Engineering Department, Engineering Faculty of the University of Porto (FEUP), where I teach in the areas of databases, data warehouses, digital preservation and discrete mathematics.

I have participated in the creation of the joint Doctoral Program in Computer Science (MAP-i) of the Universities of Minho, Aveiro and Porto and I integrate its Scientific Committee since 2007. I participated in the creation of the Information Science Bachelor (2001) and Master (1997) Programs jointly taught by the Engineering and Humanities Faculties and I integrate the corresponding Scientific Committees.

I am a member of the Scientific Council of the Engineering Faculty since 2010.

I have led the development team of SIGARRA, the U.PORTO Academic Information System, from 1996 to 2010.

I am a Researcher at INESC TEC since 1985, integrating its Administration since 2015. My main research interests are in Information Management, Digital Preservation, and Databases. I have been the leader of the projects FCT DBPreserve on preservation of databases, Gulbenkian APDIC on digital preservation plans and EEA Grant SeaBioData. Currently, I integrate the project FCT TAIL on research data management.

I have collaborated between  2000 and 2010 in the project Cooperation with the National University of Timor Leste led by the Foundation of the Portuguese Universities, as coordinator of the Informatics Engineering bachelor (2006-2010).

I am a member of the Engineers Portugal association where I have belonged to the Board of Admission and Qualification from 2010 to 2016.

Interest
Topics
Details

Details

  • Name

    Gabriel David
  • Cluster

    Computer Science
  • Role

    Member of the Board of Directors
  • Since

    01st April 1985
003
Publications

2015

Database Preservation: The DBPreserve Approach

Authors
Ur, A; Muzammal, M; David, G; Ribeiro, C;

Publication
International Journal of Advanced Computer Science and Applications - ijacsa

Abstract

2014

ViBest SHM: an information system and data repository for structural health monitoring

Authors
da Costa, FP; Cunha, A; David, G;

Publication
EURODYN 2014: IX INTERNATIONAL CONFERENCE ON STRUCTURAL DYNAMICS

Abstract
This project has been motivated by the need to standardize, preserve, and share the data sets of the Laboratory of Vibrations and Structural Monitoring (ViBest, www.fe.up.pt/vibest) of FEUP, produced by several long term projects individually managed. The solution presented is meant to support the process of Structural Health Monitoring, offering features to catalogue the projects, their goals and components, to store and visualize their acquired and processed data through time, and to preserve the data in a standardized form for all the research unit and extensible to future applications. The result is a digital archive with automatic ingestion of new data files and a Web interface with access control and tools for information management. There is a batch export functionality to deal with large data transfers. It is being used on monitoring data related with different kinds of structural health monitoring applications. The standardization and preservation of all data sets acquired in multiple applications will be certainly a solid basis for further research, either at a local basis or in the context of international joint cooperation.

2013

The impact of time in link-based Web ranking

Authors
Nunes, S; Ribeiro, C; David, G;

Publication
INFORMATION RESEARCH-AN INTERNATIONAL ELECTRONIC JOURNAL

Abstract
Introduction. The strong dynamic nature of the Web is a well-known reality. Nonetheless, research on Web dynamics is still a minor part of mainstream Web research. This is largely the case in Web link analysis. In this paper we investigate and measure the impact of time in link-based ranking algorithms on a particular subset of the Web, specifically blogs. Method. Using a large collection of blog posts that span more than three years, we compare a traditional link-based ranking algorithm with a time-biased alternative, providing some insights into the evolution of link data over time. We designed two experiments to evaluate the use of temporal features in authority estimation algorithms. In the first experiment we compare time-independent and time-sensitive ranking algorithms with a reference rank based on the total number of visits to each blog. In the second, we use feedback from communication media domain experts to contrast different rankings of Portuguese news Websites. Results. The distribution of citations to a Web document over time contains valuable information. Based on several examples we show that time-independent algorithms are unable to capture the correct popularity of sites with high citation activity. Using a reference rank based on the number of visits to a site, we show that a time-biased approach has a better performance. Conclusions. Although both time-independent and time-aware approaches are based on the same raw data, the experiments indicate that they can be treated as complementary signals for relevance assessment by information retrieval systems. We show that temporal information present in blogs can be used to derive stable time-dependent features, which can be successfully used in the context of Web document ranking.

2013

Preservation of Data Warehouses: Extending the SIARD System with DWXML Language and Tools

Authors
Aldeias, C; David, G; Ribeiro, C;

Publication
INNOVATIONS IN XML APPLICATIONS AND METADATA MANAGEMENT: ADVANCING TECHNOLOGIES

Abstract
Data warehouses are used in many application domains, and there is no established method for their preservation. A data warehouse can be implemented in multidimensional structures or in relational databases that represent the dimensional model concepts in the relational model. The focus of this work is on describing the dimensional model of a data warehouse and migrating it to an XML model, in order to achieve a long-term preservation format. This chapter presents the definition of the XML structure that extends the SIARD format used for the description and archive of relational databases, enriching it with a layer of metadata for the data warehouse components. Data Warehouse Extensible Markup Language (DWXML) is the XML language proposed to describe the data warehouse. An application that combines the SIARD format and the DWXML metadata layer supports the XML language and helps to acquire the relevant metadata for the warehouse and to build the archival format. Copyright (C) 2013, IGI Global. Copying or distributing in print or electronic forms without written permission of IGI Global is prohibited.

2013

SIARD archive browser - The components

Authors
Rahman, AU; David, G; Ribeiro, C;

Publication
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

Abstract
The Software-Independent Archival of Relational Databases (SIARD) project developed a tool known as the "SIARD Suite" for preserving relational databases. The tool converts a relational database to a XML format. This paper presents the components of the SIARD Archive Browser which is a simple to use and platform-independent tool for browsing a SIARD Archive. This may be helpful for users interested in using the software. Moreover, it may be useful for people who want to re-use the code and develop software for browsing a SIARD archive with more functionality. © Springer International Publishing 2013.

Supervised
thesis

2016

Self-Service Business Intelligence

Author
Eduardo Cardoso de Abreu

Institution
UP-FEUP

2016

Exploring the Sea: Heterogenous Geo-Referenced Data Repository

Author
Inês Davim Lopes Garganta Silva

Institution
UP-FEUP

2016

Indexação de Documentos Clínicos

Author
João de Sá Balão Calisto Correia

Institution
UP-FEUP

2016

O centro de documentação da redação do jornal Público - Edição Porto: Do físico ao digital

Author
Fábio José Carvalho Mendes

Institution
UP-FEUP

2016

Gestão do Arquivo da Faculdade de Medicina Dentária da Universidade do Porto – Aplicação do AtoM

Author
Rui Pedro Araújo Ribeiro

Institution
UP-FEUP